When was the last time you looked forward to looking at a clock? Not to find out the time per se — like gee, maybe it’s beer o’ clock already — but waited with bated breath to gaze upon a particular clock? Never? We don’t blame you, but only because you haven’t seen this fruit machine clock in action yet.
Every 60 seconds, the reels start spinning like some little man inside pulled the lever on a slot machine (or fruit machine, as they’re called across the pond). The reels slow down and stop one by one, left to right, settling on the four digits of time in 24-hour mode. Imagine the suspense of coming to see what time it is just as the reels start spinning!
[timebanditclock] grew this fruit machine out of old-school discrete logic beautifully applied to stripboard. Each of the reels has a DIY binary encoder that uses IR transmit/receive pairs to generate a binary word. These four binary words are compared to a binary clock module using comparators.
We think this is an amazing concept already, but then [timebanditclock] worked overtime by doing it all in discrete logic. Spin past the break to see a demo and stick around for the build video.
Want a challenging clock build that’s a little less challenging? Maybe it’s time to try circuit sculpture.
We caught a glimpse of this Basic Stamp 2 controlled electronic slot machine on YouTube. We’re very grateful that [Mike Donahue] was willing to share more about his project with us.
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He uses tactile switches instead of dropping coins in a slot, and a lever-style switch sets the one-armed bandit in motion. The action is displayed on a 1.5″ µOLED-128-G1 screen that has its own controller (which explains how this operates so well with the relatively slow BS2). For realism there’s some pretty good sound effects provided by a piezo speaker. We’ll look at the code, graphics, and some video after the break.
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The connections are quite simple and [Mike] has built the project on the Basic Stamp 2 Homework Board. The display is addressed through two serial lines and a reset pin.
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He generated the graphics using MSpaint, creating three full screen images that rarely change. The icons for the spinning dials are much smaller and overlayed on top of the larger images. Three of these icons are stored next to each other in memory. That way, a pointer can be advanced and the next image will start to scroll in, resembling a spinning cylinder. Here’s a bit larger version of the schematic and images if you need it.
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This makes for a fun toy and it’s quite well executed. If you’re interested in taking a look under the hood, here’s a copy of the source code.